Lasting-plate clamp.



G. G. JOHNSON.

LASTING PLATE UL'AMP. APPLICATION FILED NOV. 27, 1911 1,022,421. P n ed Apr. 9, 1912.

I/V/T/VESSES' TTNTE CARL GUSTAF JOHNSON, OF MANCHESTER, NEW HAMPSHIRE, ASSIGNOR TO UNITED SHOE MACHINERY COMFANY, OF PATERSON,

NEW JERSEY.

NEW JERSEY, A CORPORATION OF LASTING-PLATE CLAMP.

To all whom it may concern:

Be it. known that I, CARL Gnsrar JOHN- soN, a citizen of the United States, and resident of Manchester. in the county of I'lillsboro and State of New Hampshire, have invented certain Improvements in Lasting-Plate Clamps, of which the follow-' ing description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to lasting machines of the bed type and particularly to means for detachably securing the end wiper plates to their cam carriers.

The objects of the present improvements are to increase the etileiency. of these devices, to render them more reliable and to facilitate and to decrease the cost of their manufacture. The features of this invention by which these objects are accomplished will appear from the following description and will then be pointed out in the claims.

Figure 1 is a perspective view of the toe lasting mechanism of a well known bed lasting machine fully described in British specification No. 22,630 of 1908, showing the wipers clamped in operative position upon their cam carrier plates. Fig. 2 is av side elevation ofthc clamp, the wiper and the cam plate being shown in section and the clamp lever being .shown in dotted lines in its upturned or wiper releasing position. Fig. 8 is a perspective view of the clamp separated from the wiper and cam plate. Fig. 4: shows the relation of the cam lever and the trunnion block which must be obtained in order to detach the lever.

An example of a prior construction is explained in the British specification to which reference may be had for further details about this type of machine. These machines coinprisc among other parts a toe lasting head 2 in which toe embracing wiper plates 5 are mounted for advancing and closing movement over'the margin of the shoe bottom and these plates have their inner edges shaped according to the contour of the toe portion of the shoe bottom. l? or styles of lasts that differ in this contour and for styles in which the right and left toes are unsynnnetrical separate wiper plates are provided and frequent changes of these plates for one another are required. The plates 5 are accordingly removably attached Specification of Letters iatent.

Application filed November 27, 1911. Serial No. 662,653.

and stem can turn together about the axis Fatented Apr. a, rare.

to the cam carriers. 10 which have curved slots into which rise roller studs from the head to guide and direct operative movements which are derived from an actuating rod 12. The cam carrier 10 is recessed on its lower face from the front edge backwardly, the back wall of the recess being inclined forwardly to provide a supporting ledge for the rcar'edge of the plate 5 which is similarly shaped. The vertical depth of the recess is equal to the thickness of the plate 5 so that the lower faces of the cam carrier and of the lasting plate are flush. From the rear edge of the plate is cut. for wardly a slot to receive the stem of a locking bolt 20, said plate being countersunk at the front end of the slot to provide a seat 22 for the head of the bolt flush with the lower faces of the plate and carrier. In vertical alinenient with this seat is a hole in the cam carrier through which the stem of the bolt slides freely. Above the cam carrier the stem is encircled by a stiff spring 23 capped by a cupped washer 2et. The upper end of the stem is threaded and thereon is adjustable a block 25 which has trunnions 26.

On these trunnions are engaged hooks 28 on the lower end of a lever 30. The outer edge faces of the hooks 28 are eccentric to said trunnions and adapted to engage with the top face of the cupped washer 24, when the lever 30 is turned, to wedge between said washer and the block 25 and draw the head of the locking bolt into its seat 22 in the lasting plate to secure the plate firmly to the carrier cam. The spring 23 takes up any slight variation in thickness of parts while affording an approximately rigidclamping of the lasting plate to the cam carrier. The adjustment of the block 25 on stem 20 is required for the dilferences in thickness of plates and cam carriers arising in the course of their manufacture. It is contemplated that this adjustment of the block 25 on stem 20 will be required only when the machine is set up and possibly from time to time to compensate for wear of the eccentric faces of the hooks 28 on the washer 24. It is undesirable that any accidental turning of'the block on the stem should occur and therefore a locking screw is threaded into the block 25 transversely of the stem 20 to engage that stem and lock the block to the stem. Then the lever block operator.

of the stem to throw the handle end of the lever into any convenient position for the As above noted the ends 28 of the lever are formed as hooks to engage the trunnions 26. Between the trunnions which are made integral with the block 25 and of substantial size to afford abundant strength and durability which it was impractical to obtain in trunnions screwed into the block the lever is cut away to receive the body of the block and there is insuflicient play between the block and the rear ,wall of this recess in the lever to allow the hooks to become disengaged from the trunnions;

To provide for assembling the lever 30 and block 25 the block is cut away on a chord on its lower side at 27 through which the stem 20 extends'upwardly, 'to provide a flat face which can be alined with the flat rear wall of the lever, when the block is detached from the stem 20 as in Fig. 4, and will then permit the hooks and trunnions to be engaged for assembling or disengaged. for replacing worn parts. The outer end of the locking screw 35 stands in the path of and limits the tipping movement of the lever 30 backward so that when it is lifted to release a lasting plate it stands up in position to be conveniently reengaged by the operator when a plate has been fitted into the cam carrier.

The provision of the'hooks 28 on the lever permits the use of a block 25 having integral trunnions, thus obtaining increased strength with a lower cost of manufacture than when screw or pin trunnions were used with an eye in the portions of lever 80 which correspond with the hooks 28 while the relative formation of the lever and the block prevents accidental disengagement of said parts while permittingthem to be readily assembled. The adjustment of block 25 on stem 20 permits the use of less expensive care in manufacture and enables any required degree'of compression on spring 23 to be obtained, while the locking screw 35 makes the adjustment secure and affords a stop for the lever;

Having explained the nature of the invention and described how it may be made and used, I claim as new and desire to secure by Letters Patent of the United States:

1. In a lasting machine the combination witha wiper plate and a carrier therefor, of a clamping bolt extending through said parts and having its head in a countersunk seat that is formed in the lower face of the plate and connected with the edge thereof by a slot, a block threaded on the upper end of the bolt and having a plane lower face and trunnions'formed on its ends, a lever formed with hooks on its lower. end and re I cessed to permit the hooks and trunnions to be interengaged only when the block is disconnected from the bolt and'presented with plate its plane face against the back wall of the recess, said hooks having eccentricfaces to efiect a downward pressure for drawing the bolt into clamping position when the lever is rocked. 1

2. In a lasting machine the combination with a wiper plate and a carrier therefor, of

a clamping bolt extending? through said parts, a block on the upperi'end of the bolt having trunnions on its ends, a lever having hooks engaged with said trunnions and pro vided wit-h edge faces that \are eccentric with relation to the trunnion seats in the .hooks and are adapted to wedge the block the spring and provided with trunnions, a

lever fulcrumed on the trunnions and having an eccentric head for wedging the bolt and-the carrier apart yieldingly through the spring to effect'clamping of the plate and carrier together, and a locking screw fastening the block in adjusted position on the bolt and serving as a stop to limit movement of the lever.

4. In a lasting machine the combination of a clamping bolt extending through said parts, ablock threaded on the bolt and having trunnions on its ends and a plane-face formed approximately on a chord of a circle of which the trunnions are'the center, and a lever having books which can only be engaged with or disengaged from the trunnions when the plane face of the block is presented in predetermined angular relation to the lever, and eccentric faces on the lever to enable it to act through the block and the carrier for causing the bolt to clamp the lasting plate to the carrier.

5. In a lasting machine the combination with a wiper plate and a carrier therefor, of a clamping bolt extending through said parts and having its head in a countersunk seat that is formed in the lower face of the and connected with the edge thereof by a slot, a block threaded on the upper or tion of the bolt for adjustment from an toward the carrier, a lever fulcrumed on the block and adjustable therewith, a spring en circling the bolt between the carrier and the lever, and a washer capping the spring, said lever being formed with eccentric faces for engagement with the washer all arranged to effect clamping of the plate to the carrier yieldingly with a force determined by the adjusted position of the block on the bolt.

6. In a lasting machine the combination with a wiper carrier, of a clamping bolt having a stem and a head, a wiper plate 'with a wiper plate and'a carrier therefor,

provided with a hole for the bolt stem and a countersink for its head and with a slot to permitthe plate to be Withdrawn edge- Wise from the stem when the head of the 5 clamp is depressed below. its countersunk seat, a block adjust 'bly mounted on the bolt above the carrier and having permanently attached trunnions, and an eccentric locking lever having hooks which can not be dis-v 10 engaged from said trunnions after the block has been applied to the stem and Which has an eccentric head for effecting wedging action to draw the head of the bolt into its seat and lock it.

In testimony whereof I have signed my 15 name to this specification in the presence of two subscribing Witnesses.

CARL ,GUSTAF JOHNSON.

Witnesses:

ALBERT A. MACLEOD, CYRUs vA. SULLowAY. 

